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Multi-Pixel Gas Sensors - SGP

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The SGP offers a complete gas sensor system that has been integrated into a total DFN packaging with dimensions of only 2.45 × 2.45 × 0.9 mm³. With an I²C interface, this multi-pixel gas sensor exhibits fully calibrated air quality output signals, thereby offering users an improved range of possibilities for measuring indoor air quality.

Equipped with Sensirion’s MOXSens^® Technology, the SGP exhibits an unparalleled robustness against potential contamination by siloxanes, thereby improving the long-term stability and accuracy of this gas sensor system. Furthermore, through the use of multiple metal-oxide sensing elements, otherwise referred to as the pixels within this system, all of which are incorporated onto a single chip, the SGP is capable of providing users with significantly improved air quality signals.

The unprecedented combination of long-term stability and multi-pixel technology makes the SGP an ideal choice for the mobile monitoring of indoor air quality levels that can be incorporated into mobile, smart home and appliance applications.

Overview of Sensirion’s Gas Sensors

Product	SGP30	SGPC3	SVM30 (coming soon)
Output	Total VOC measured in ppb Hydrogen (H₂) based CO₂-eq in ppm	Total VOC measured in ppb	Total VOC measured in ppb Hydrogen (H₂) based CO₂-eq in ppm Relative Humidity Temperature
Supply Voltage	1.62-1.98 V	1.62-1.98 V	4.5-5.5 V
Average Current	48 mA	Low power mode: 1 mA Ultra-low power mode: 0.065 mA	49 mA
Package	6-pin DFN 2.45 x 2.45 x 0.9 mm³	6-pin DFN 2.45 x 2.45 x 0.9 mm³	PCB 39 x 15 x 6.5 mm³
Interface	I²C 1.8 V	I²C 1.8 V	I²C 5 V
Indoor Air Quality
Typical Accuracy	15% of measured value	15% of measured value	15% of measured value
Output Range¹	TVOC: 0 – 60,000 ppb CO₂-eq: 0 – 60,000 ppm	TVOC: 0 – 60'000 ppb	TVOC: 0 – 60,000 ppb CO₂-eq: 0 – 60,000 ppm
Sampling Rate	1 s	Low power mode: 2 s Ultra-low power mode: 30 s	1 s
Long-term Stability	MOXSens^® Siloxane Resistance Typical 1.3% accuracy drift each year in siloxane accelerated lifetime test
Baseline Compensation	On-chip baseline compensation algorithm
Humidity Compensation	Yes²	Yes²	Yes²
Temperature
Measurement Range	-	-	–20 °C – 85 °C
Typical Accuracy	-	-	± 1 °C
Humidity
Measurement Range	-	-	0% – 100% RH
Typical Accuracy	-	-	± 5% RH

Please note that the above values are of indicatory nature only.

¹ CO₂-eq output is based on a hydrogen measurement. The SGP is not suited for applications where real CO₂ detection is required.
² To use the humidity compensation feature of the SGP an additional humidity sensor like the SHTxx is required.

Test Environmental Sensors with Sensirion’s Evaluation Kits

The SEK-Environmental Sensing system incorporates plug-and-play hardware, a user-friendly viewer software and a versatile compatibility with all environmental sensors, thereby improving the ease and rate of performing evaluations. By improving this aspect of air quality measurement processes, Sensirion allows customers to instead focus on the development of innovative sensor applications.

Long-Term Stability of Metal-Oxide Gas Sensors

Traditional metal-oxide gas sensors suffer from poor long-term stability that occurs as a result of irreversible contamination by siloxanes, which typically causes a loss in VOC sensitivity and significant increase in response time.

Where are Siloxanes Found?

Indoor environments
Most abundant VOC emitted by humans
Consumer products

The MOXSens^® Technology Solution

Sensirion’s MOXSens^® Technology that is found in the SGP offers an unmatched robustness against siloxanes, thereby providing users with a unique long-term stability and accuracy.

The sensing principle of the SGP is based on a heated film of metal-oxide (MOx) nanoparticles. When oxygen is adsorbed onto the metal-oxide layer, the gas particles react with the target gas that causes a release of electrons. This reaction produces a change in the electrical resistance of the metal-oxide layer, which can then be detected and accurately measured by the sensor.

The SGP multi-pixel gas sensor platform integrates four sensing elements, or pixels, into one single DFN package. By utilizing Sensirion’s CMOSens^® Technology, the SGP is equipped with a single chip sensor system that is comprised of a digital I²C interface, a temperature-controlled micro hotplate, as well as pre-processed and calibrated indoor air quality signals.

The SGP, which combines both Sensirion’s multi-pixel gas measurement platform with the highly optimized metal-oxide sensing materials, exhibits a unique resistance against contamination by siloxanes. As a result, Sensirion’s MOXSens^® Technology enables the highest sensitivity and reliability when acquiring gas measurements for indoor air pollutants, such as volatile organic compounds and hydrogen.

Environmental Sensing

Sensirion’s sensor solutions provide users with detailed and reliable data on a wide variety of environmental conditions with the potential to significantly impact the well-being, comfort and productivity of the world around them. These parameters include humidity and temperature, as well as the varying concentrations of volatile organic compounds (VOCs), particulate matter (PM2.5) and CO₂.

Environmental Sensing technology introduces a new realm of measurement possibilities through the use of smarter devices that are ultimately aimed at improving our comfort and well-being, all the while increasing energy efficiency for a number of different sensor applications.

Indoor Air Quality and Volatile Organic Compounds

It has been determined that most people will spend approximately 90% of their day indoors, which are areas that typically exhibit significantly higher concentrations of gaseous pollutants as compared to what is present in outdoor locations. As a result, an increase in the concentrations of volatile organic compounds (VOCs) has been associated with the widespread use of new products and building materials, as well as the improved insulation for energy efficiency.

When considering indoor VOCs, they typically originate from the use of paints, solvents, carpets, furniture, cleaning agents, as well as emissions by human beings. Although the presence of VOCs is fairly normal, an abnormal elevation of these levels can have a negative impact on well-being, comfort and cognitive abilities of those exposed to them.

As a result, it is recommended that exposure to high levels of VOCs can be avoided or significantly reduced through the use of regular ventilation, air purification and removal of strong VOC sources.

The Total VOC (TVOC) concept is a well-established, practical, time and cost-effective method of surveying indoor environments for potential VOC contamination. Sensirion’s multi-pixel gas sensor SGP enables measurement of TVOC levels in an effort to improve the efficiency of ventilation and air purification systems while simultaneously increasing the awareness of VOC sources and indoor air pollution.